Emissive Substoichiometric Covalent Organic Frameworks for Water Sensing and Harvesting

Maiti, Sayan; Sharma, J.; Ling, Jianheng; Tietje‐Mckinney, Dylan; Heaney, Matthew P.; Runčevski, Tomče; Addicoat, Matthew A.; D’Souza, Francis; Milner, Phillip J.; Das, Anindita

doi:10.1002/marc.202200751

Cited by 10 publications

(19 citation statements)

References 39 publications

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“…A mesoporous COF structure may not be a good candidate to consider if the active sites are not strong enough to interact with water molecules. [29,30] In contrast, a COF with micropore size less than 7 Å is not favorable to form water network. [31] It is recommended to synthesize COFs bearing pore sizes ranging from 8 to 20 Å. Additionally, adsorptive sites functionalized on the framework are the key to determine the RH where the cutoff of water isotherm occurs.…”

Section: Properties Required For Cof Water Harvestersmentioning

confidence: 99%

Covalent Organic Frameworks for Atmospheric Water Harvesting

Nguyen

2023

Advanced Materials

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of water in the air varies by location). For direct air cooling, it is applicable in places with high relative humidity (RH). [9] However, in low-humidity air (i.e., arid conditions), the direct air-cooling method is not a good option due to its high energy consumption in cooling the air to the dew point. [10] Water capture assisted by sorbents holds promise because water vapor is concentrated into the pores of the sorbent and pure and drinkable water can subsequently be collected through temperature or pressure swing. [13] This reduces the sensible heat required to cool the air, making this technology applicable in arid conditions. [13] Additionally, the sorbent-assisted water capture eliminates limitations on whether and region, so in principle, it can be applied anywhere and anytime. [14] Covalent organic frameworks (COFs) are one type of reticular materials made up of organic building units that are held together by strong covalent bonds, creating extended structures. [15][16][17][18] The bond energy between the organic building units in COFs is high (300-600 kJ mol −1 ), [19] which makes them more stable than other materials, [20] such as metal-organic frameworks (MOFs), H-bond frameworks, and metal complexes. Being made entirely of organic building units, COFs may be suitable for applications in human life where metal leaching could pose health risks. In addition, COFs are designed by linking pre-synthesized organic units through covalent bonds, enabling the synthesis of targeted frameworks with interesting properties, including porosity and various structure types. [15,17,21,22] These properties make COFs suitable for atmospheric water harvesting, an application that is expected to increase in the future. [23] This article highlights several important features that are required for COF water harvesters and discusses the achievements of using COFs for this purpose. Finally, an outlook for COFs in this research field is provided. Water IsothermsFor physisorption, International Union of Pure and Applied Chemistry classifies six types of sorption isotherms, type I-VI. [24] Type I isotherm represents a very strong interaction between water molecules and the frameworks in narrow micropores, resulting in a maximum amount of water loading into the pore structure at very low RH (0-10% RH). Zeolites, porous oxides, and open metal sites in MOFs can have this type I water isotherm. [23,25] In the chemistry of COFs, water isotherms can be types II, III, IV, and V. [23,26] Type II isotherms Atmospheric water harvesting using reticular materials is an innovation that has the potential to change the world. Using covalent organic frameworks (COFs) for capturing water holds great promise because COFs are metal-free, stable under working conditions, and their structure can be intentionally designed to meet the requirements for this application. To promote the chemistry and use of COFs for atmospheric water harvesting, important features for synthesizing suitable water-harvesting COFs are discussed. The achievements of using ...

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Section: Properties Required For Cof Water Harvestersmentioning

confidence: 99%

Covalent Organic Frameworks for Atmospheric Water Harvesting

Nguyen

2023

Advanced Materials

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“…The possible mechanism is related to the intramolecular hydrogen bonds and protonation or deprotonation process [43,58,61–63] Organic molecules [64–60] . (a) Volatile organic compounds (VOCs).…”

Section: Covalent Organic Framework: Luminescence and Luminescence Re...mentioning

confidence: 99%

“…[42] (3) Inorganic molecules. [55][56][57][58][59][60][61][62][63] (a) Iodine (I 2 ). Two COFs systems are related to their adsorption of I 2 : cyclotriphosphazenebased COFs (HDADE, HBAPB and HBPDA) by the polycondensation of hexa(4formylphenoxy)cyclotriphosphazene (NOP-6-CHO) and hydrazine hydrate (HAZ) or 4,4'-azodi -aniline (AZDA) as well the azine-(HHAZ) and azo-based (HAZDA) COFs.…”

Section: Luminescence Responsive Chemical Sensing Of Cofs: Analytementioning

confidence: 99%

“…Water molecules can interfere with the ICT and ESIPT effects due to their hydrogen bonding interaction between them (as a hydrogen bond donor) and the COFs moiety (as a hydrogen bond acceptor). [57][58][59][60] (c) Acid/alkali vapor and pH value. Typical COFs involve CZ-DHZ-COF using bicarbazole as the main building blocks and a hydrazone as the linkage and the TPE-DHZ-COF of 2,5,8,11-tetrakis(4aminophenyl)perylene (Per (NH 2 ) 4 ) with the hydrazone bond as the linkage and the monomer of triphenylbenzene (TPE).…”

Section: Luminescence Responsive Chemical Sensing Of Cofs: Analytementioning

confidence: 99%

“…COF‐TT from bis(tetraoxacalix[2]arene‐[2]triazine) and tetra( p ‐aminophenyl)methane, shows luminescence quenching sensing toward Cr 2 O 7 2− /CrO 4 2− and MnO 4 − anions, which is attributed to the common strong competitive adsorption of excitation energy between COF‐TT and anions [42] Inorganic molecules [55–63] . (a) Iodine (I 2 ).…”

Section: Covalent Organic Framework: Luminescence and Luminescence Re...mentioning

confidence: 99%

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Lanthanide Functionalized Covalent Organic Frameworks Hybrid Materials for Luminescence Responsive Chemical Sensing

Yan

2023

Chemistry A European J

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Covalent organic frameworks (COFs) possess several unique features of structural and functional chemistry, together with other modular photophysical performance, which make them candidates for luminescence responsive chemical sensing. Lanthanide (Ln3+) functionalized COFs hybrid materials still keep the parent COFs’ virtues and also embody the abundant multiple luminescence response with both COFs and Ln3+ ions or other guest species. In this review, the summary is highlighted on the lanthanide functionalized COFs hybrid materials and their relevant systems for luminescence responsive chemical sensing. It is subdivided into five sections involving the three main topics. Firstly, the basic knowledges of COFs materials related to the luminescence responsive chemical sensing are introduced (including three sections), involving the chemistry, application and post‐synthetic modification (PSM) of COFs, the luminescence and luminescence responsive chemical sensing, and the luminescence responsive chemical sensing of non‐lanthanide functionalized COFs hybrids materials. Secondly, the systematic progresses are outlined on the lanthanide functionalized COFs hybrid materials in luminescence responsive chemical sensing, which is the emphasis for this review. Finally, the conclusion and prospect are given.

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Sub‐Stoichiometric Covalent Organic Frameworks

Qian,

Li,

Teo

et al. 2024

Adv Funct Materials

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Covalent organic frameworks (COFs) have garnered significant attention for nearly two decades due to their exceptional structural designs, tunable properties, and wide‐ranging applications. Recently, a novel subclass of COFs known as partially condensed, sub‐stoichiometric COFs (ss‐COFs) has emerged. This presents a promising new avenue for constructing distinct COF structures in contrast to fully condensed, stoichiometric COFs (fc‐COFs). ss‐COFs are deliberately designed with periodic unreacted functional groups, thereby giving rise to intriguing electronic, optical, and catalytic properties. The deviation from conventional stoichiometric approach opens up new prospects to tailor material properties for unexplored applications. Here, this review focuses on the latest advancements and breakthroughs in ss‐COFs, including topological design, structure characterization, synthetic method, and practical applications. From their basic designing principles to cutting‐edge properties, it will be explored how ss‐COFs are paving the way for COFs research and pushing the boundaries toward new scientific and technological possibilities.

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Emissive Substoichiometric Covalent Organic Frameworks for Water Sensing and Harvesting

Cited by 10 publications

References 39 publications

Covalent Organic Frameworks for Atmospheric Water Harvesting

Covalent Organic Frameworks for Atmospheric Water Harvesting

Lanthanide Functionalized Covalent Organic Frameworks Hybrid Materials for Luminescence Responsive Chemical Sensing

Sub‐Stoichiometric Covalent Organic Frameworks

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